Improvement in xwater-proof c cement



sirable color to the cement.

incited States fittest Gtilfiitr.

THOMAS S. CLARK, OF OHARLEST-OWN, MASSACHUSETTS.

Letters Patent No. 105,648, dated July 26, 1 870.

IMPROVEMENT IN WATER-PROOF CEMENT.

Thefichedule referred to in these Letters Patent and making part of the same.

I, THOMAS S. CLARK, otGharlestown, in the county of Middlesex and State of Massachusetts, have inventeda new and useful Water-proof Cement, for builders use,0t'which the following is a specification.

My invention consists In the first place,in the employmenuin the manufactnre of water-proof cement, of burntlinseed oil, prepared byboiling, and thensetting fire to it, by-thrusting burning' brands into it, until it shrinks in bulk about twenty per cent. This mode of preparation destroys-the drying properties of the oil, and causes it to become sticky, so that, while a cement, of which oil thus 'prepared is'component part, will adhere firmly to wood, brick, stone, or iron, it will not dry so asto destroy its elasticity or cause it to crack.

The second part of my invention consists in mixing equal quantities of oil, prepared as above, common sand, and f yellow ochre, with one-half the quantity oti brown poko.

The sand is a cheap material togive body to the cement; the yellow ochre prevents the sand and oil from running, and the f of the cement; but

poko is used to give a de- Claims.

1. The employment of burnt linseed-oil" in themanufacture of water-proof cement, substantially as described,

2. A water-proot'cement, compounded as herein set forth and described, fol-the purposes specified.

Executed at Boston thisld day ot' June, 1870.

I THOMAS S. CLARK.

Witnesses N. O. LOMBARD,

PROUTY. 

